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Figure 4. (a) CVs of GCO-gCN/GCE electrodes in solutions containing TP in PBS at various pH values and 50 mV∙s−1,(b) CVs of GCO-gCN/GCE, GCO, gCN, and bare GCE in the solution containing TP at pH 7.0 and 50 mV∙s−1,(c) CVs of GCO-gCN/GCE at different scan rates(10-250 mV∙s−1) at pH 7.0 in the presence of TP,(d) The corresponding linear plot of square root scan rate vs. current,(e) CVs of GCO-gCN/GCE with various TP concentrations at pH 7.0 and at 50 mV∙s−1,(f) The respective linear plot of TP concentration vs. current. Reproduced with permission of Ref.[65]. Copyright 2024, Elsevier